NSUF 16-655: Evaluate the ferrite decomposition in irradiated duplex cast stainless steels
The work is aimed to complete the study on cast stainless steels irradiated to 5, 10, 20 and 40 dpa at 320°C in the Bor-60 reactor. Previous study of 20 and 40 dpa irradiated samples shows that microstructures of irradiated ferrite phase mainly consist of spinodal decomposition and G-phase precipitates, however, it is not concluded whether evolutions of spinodal decomposition or G-phase precipitates already saturated at 20 dpa or at a much lower dose since the difference of irradiated microstructure in between 20 and 40 dpa samples is very minimal. Therefore it is desired to characterize the samples irradiated to lower doses of 5 and 10 dpa. Both the transmission electron microscope and atom probe tomography will be used to study the irradiated induced nano-sized features including dislocation, phase separation and precipitates. The output from the execution of proposed study will complete the construction of the response of ferrite in duplex stainless steels to a wide range of neutron irradiation dose. By correlating the microstructure study with the selected mechanical tests, this proposed research will provide a fundamental understanding on the response of duplex cast stainless steel ( or welds) during the designed 40 years reactor life, and more relevantly, during the extended life of 60 years and beyond.
Additional Info
| Field | Value |
|---|---|
| Abstract | The work is aimed to complete the study on cast stainless steels irradiated to 5, 10, 20 and 40 dpa at 320°C in the Bor-60 reactor. Previous study of 20 and 40 dpa irradiated samples shows that microstructures of irradiated ferrite phase mainly consist of spinodal decomposition and G-phase precipitates, however, it is not concluded whether evolutions of spinodal decomposition or G-phase precipitates already saturated at 20 dpa or at a much lower dose since the difference of irradiated microstructure in between 20 and 40 dpa samples is very minimal. Therefore it is desired to characterize the samples irradiated to lower doses of 5 and 10 dpa. Both the transmission electron microscope and atom probe tomography will be used to study the irradiated induced nano-sized features including dislocation, phase separation and precipitates. The output from the execution of proposed study will complete the construction of the response of ferrite in duplex stainless steels to a wide range of neutron irradiation dose. By correlating the microstructure study with the selected mechanical tests, this proposed research will provide a fundamental understanding on the response of duplex cast stainless steel ( or welds) during the designed 40 years reactor life, and more relevantly, during the extended life of 60 years and beyond. |
| Award Announced Date | 2016-04-11T00:00:00 |
| Awarded Institution | None |
| Facility | None |
| Facility Tech Lead | Yaqiao Wu |
| Irradiation Facility | None |
| PI | Yong Yang |
| PI Email | [email protected] |
| Project Type | RTE |
| RTE Number | 655 |